package com.itheima.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.support.hsf.HSFJSONUtils;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Slf4j
//@Component // 放进IOC
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override // 目标方法运行前执行，返回true：放行，返回false ：不放行
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {

        String url = req.getRequestURL().toString();
        log.info("请求的url:{}", url);

        if (url.contains("login")){
            log.info("登录操作，执行.....");
            return true;
        }

        // 3.获取请求头中的令牌（token）
        String jwt = req.getHeader("token");

        // 4.判断令牌是否存在，如果不存在，返回错误结果
        if (!StringUtils.hasLength(jwt)) {
            log.info("请求头token为空，返回未登录信息");
            Result error = Result.error("NOT_LOGIN");
            String s = JSONObject.toJSONString(error);
            resp.getWriter().write(s);
            return false;
        }

        // 5.解析token，如果解析失败，返回错误结果
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            e.printStackTrace();
            log.info("解析失败返回错误登录信息");
            Result error = Result.error("NOT_LOGIN");
            String s = JSONObject.toJSONString(error);
            resp.getWriter().write(s);
            return false;
        }

        log.info("令牌合法放行");
        return true;
    }

    @Override //标资源方法运行后运行
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
    }

    @Override // 视图渲染完毕后运行，最后运行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}
